The Siemens 5SY6020-6KL is a SENTRON miniature circuit breaker (MCB) with a 1-pole+N configuration, B-curve tripping characteristic, rated 20 A at 230 V AC, and a 6 kA breaking capacity per EN 60898. This is the current-production variant — lifecycle stage is active, so it's the standard line-item for new panels and BOM replacements alike. The 1P+N form factor switches both line and neutral, with the neutral pole switching but not protecting; the neutral conductor is disconnected when the breaker is off, which matters for isolation during panel service.
Screw terminals with a specified torque of 2.0–2.5 N·m (17.7–22.1 lbf·in). The top and bottom terminals are not combined (separate entry points for line and load), which is standard for this class.
Rated for ambient temperatures from -25 to +45 °C during operation, with periodic excursions to +55 °C at up to 95% relative humidity. Storage range is wider: -40 to +75 °C. Halogen-free and silicon-free construction, which matters for clean-room or sensitive electronics environments where outgassing is a concern. Vibration-resistant per IEC 60068-2-6. Overvoltage category III, so it's rated for fixed-installation distribution boards (not just downstream equipment).